http://songwritershalloffame.org/exhibits/eras/C1104The “Stage and Film” section of the Songwriters Hall of Fame website features nearly all the composers mentioned in the exhibit, with links to biographies, song catalogs, audio clips, and recommended recordings.

http://www.loc.gov/loc/lcib/9809/gershwin.htmlDescription of the Library of Congress collection of George and Ira Gershwin materials, and the Gershwin Room at the Library, which houses George’s Gershwin’s piano and other memorabilia.